Moved GlueGen out of the JOGL workspace and into its own project.

Restructured JOGL and JOAL build processes to separately invoke
GlueGen's main build.xml before using it to generate their code.
Refactored OS/CPU detection code into gluegen-cpptasks.xml build file
in GlueGen workspace, which is now imported by both the JOGL and JOAL
build processes. Unfortunately it seems to be somewhat difficult to
completely factor out the C compiler configuration into the GlueGen
workspace so this has been left for a later date. Added missed
ALProcAddressLookup file to JOAL workspace. Updated JOGL and JOAL
build documentation. More documentation for the GlueGen workspace is
forthcoming.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/../svn-server-sync/gluegen/trunk@3 a78bb65f-1512-4460-ba86-f6dc96a7bf27

5 files changed, 630 insertions, 0 deletions

diff --git a/src/java/com/sun/gluegen/runtime/BufferFactory.java b/src/java/com/sun/gluegen/runtime/BufferFactory.java
new file mode 100644
index 0000000..ce46d14
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/BufferFactory.java
@@ -0,0 +1,240 @@
+/*
+ * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.gluegen.runtime;
+
+import java.nio.*;
+
+public class BufferFactory {
+  public static final int SIZEOF_BYTE = 1;
+  public static final int SIZEOF_SHORT = 2;
+  public static final int SIZEOF_INT = 4;
+  public static final int SIZEOF_FLOAT = 4;
+  public static final int SIZEOF_LONG = 8;
+  public static final int SIZEOF_DOUBLE = 8;
+
+  public static ByteBuffer newDirectByteBuffer(int size) {
+    ByteBuffer buf = ByteBuffer.allocateDirect(size);
+    buf.order(ByteOrder.nativeOrder());
+    return buf;
+  }
+
+  /** Helper routine to tell whether a buffer is direct or not. Null
+      pointers are considered direct. isDirect() should really be
+      public in Buffer and not replicated in all subclasses. */
+  public static boolean isDirect(Buffer buf) {
+    if (buf == null) {
+      return true;
+    }
+    if (buf instanceof ByteBuffer) {
+      return ((ByteBuffer) buf).isDirect();
+    } else if (buf instanceof FloatBuffer) {
+      return ((FloatBuffer) buf).isDirect();
+    } else if (buf instanceof DoubleBuffer) {
+      return ((DoubleBuffer) buf).isDirect();
+    } else if (buf instanceof CharBuffer) {
+      return ((CharBuffer) buf).isDirect();
+    } else if (buf instanceof ShortBuffer) {
+      return ((ShortBuffer) buf).isDirect();
+    } else if (buf instanceof IntBuffer) {
+      return ((IntBuffer) buf).isDirect();
+    } else if (buf instanceof LongBuffer) {
+      return ((LongBuffer) buf).isDirect();
+    }
+    throw new RuntimeException("Unknown buffer type " + buf.getClass().getName());
+  }
+
+
+  /** Helper routine to get the Buffer byte offset by taking into
+      account the Buffer position and the underlying type.  This is
+      the total offset for Direct Buffers.  */
+
+  public static int getDirectBufferByteOffset(Buffer buf) {
+    if(buf == null) {
+      return 0;
+    }
+    if(buf instanceof ByteBuffer) {
+      return (buf.position());
+    } else if (buf instanceof FloatBuffer) {
+      return (buf.position() * SIZEOF_FLOAT);
+    } else if (buf instanceof IntBuffer) {
+      return (buf.position() * SIZEOF_INT);
+    } else if (buf instanceof ShortBuffer) {
+      return (buf.position() * SIZEOF_SHORT);
+    } else if (buf instanceof DoubleBuffer) {
+      return (buf.position() * SIZEOF_DOUBLE);
+    } else if (buf instanceof LongBuffer) {
+      return (buf.position() * SIZEOF_LONG);
+    } 
+
+    throw new RuntimeException("Disallowed array backing store type in buffer "
+                               + buf.getClass().getName());
+  }
+
+
+  /** Helper routine to return the array backing store reference from
+      a Buffer object.  */
+
+   public static Object getArray(Buffer buf) {
+     if (buf == null) {
+       return null;
+     }
+     if(buf instanceof ByteBuffer) {
+       return ((ByteBuffer) buf).array();
+     } else if (buf instanceof FloatBuffer) {
+       return ((FloatBuffer) buf).array();
+     } else if (buf instanceof IntBuffer) {
+       return ((IntBuffer) buf).array();
+     } else if (buf instanceof ShortBuffer) { 
+       return ((ShortBuffer) buf).array();
+     } else if (buf instanceof DoubleBuffer) {
+       return ((DoubleBuffer) buf).array();
+     } else if (buf instanceof LongBuffer) {
+       return ((LongBuffer) buf).array();
+     }
+
+     throw new RuntimeException("Disallowed array backing store type in buffer "
+                                + buf.getClass().getName());
+   } 
+
+
+  /** Helper routine to get the full byte offset from the beginning of
+      the array that is the storage for the indirect Buffer
+      object.  The array offset also includes the position offset 
+      within the buffer, in addition to any array offset. */
+
+  public static int getIndirectBufferByteOffset(Buffer buf) {
+    if(buf == null) {
+      return 0;
+    }
+    int pos = buf.position();
+    if(buf instanceof ByteBuffer) {
+      return (((ByteBuffer)buf).arrayOffset() + pos);
+    } else if(buf instanceof FloatBuffer) {
+      return (SIZEOF_FLOAT*(((FloatBuffer)buf).arrayOffset() + pos));
+    } else if(buf instanceof IntBuffer) {
+      return (SIZEOF_INT*(((IntBuffer)buf).arrayOffset() + pos));
+    } else if(buf instanceof ShortBuffer) {
+      return (SIZEOF_SHORT*(((ShortBuffer)buf).arrayOffset() + pos));
+    } else if(buf instanceof DoubleBuffer) {
+      return (SIZEOF_DOUBLE*(((DoubleBuffer)buf).arrayOffset() + pos));
+    } else if(buf instanceof LongBuffer) {
+      return (SIZEOF_LONG*(((LongBuffer)buf).arrayOffset() + pos));
+    } 
+
+    throw new RuntimeException("Unknown buffer type " + buf.getClass().getName());
+  }
+
+  public static void rangeCheck(byte[] array, int offset, int minElementsRemaining) {
+    if (array.length < offset + minElementsRemaining) {
+      throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
+    }
+  }
+
+  public static void rangeCheck(char[] array, int offset, int minElementsRemaining) {
+    if (array.length < offset + minElementsRemaining) {
+      throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
+    }
+  }
+
+  public static void rangeCheck(short[] array, int offset, int minElementsRemaining) {
+    if (array.length < offset + minElementsRemaining) {
+      throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
+    }
+  }
+
+  public static void rangeCheck(int[] array, int offset, int minElementsRemaining) {
+    if (array.length < offset + minElementsRemaining) {
+      throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
+    }
+  }
+
+  public static void rangeCheck(long[] array, int offset, int minElementsRemaining) {
+    if (array.length < offset + minElementsRemaining) {
+      throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
+    }
+  }
+
+  public static void rangeCheck(float[] array, int offset, int minElementsRemaining) {
+    if (array.length < offset + minElementsRemaining) {
+      throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
+    }
+  }
+
+  public static void rangeCheck(double[] array, int offset, int minElementsRemaining) {
+    if (array.length < offset + minElementsRemaining) {
+      throw new ArrayIndexOutOfBoundsException("Required " + minElementsRemaining + " elements in array, only had " + (array.length - offset));
+    }
+  }
+
+  public static void rangeCheck(Buffer buffer, int minElementsRemaining) {
+    if (buffer == null) {
+      return;
+    }
+
+    if (buffer.remaining() < minElementsRemaining) {
+      throw new IndexOutOfBoundsException("Required " + minElementsRemaining + " remaining elements in buffer, only had " + buffer.remaining());
+    }
+  }
+
+  public static void rangeCheckBytes(Buffer buffer, int minBytesRemaining) {
+    if (buffer == null) {
+      return;
+    }
+
+    int elementsRemaining = buffer.remaining();
+    int bytesRemaining = 0;
+    if (buffer instanceof ByteBuffer) {
+      bytesRemaining = elementsRemaining;
+    } else if (buffer instanceof FloatBuffer) {
+      bytesRemaining = elementsRemaining * SIZEOF_FLOAT;
+    } else if (buffer instanceof IntBuffer) {
+      bytesRemaining = elementsRemaining * SIZEOF_INT;
+    } else if (buffer instanceof ShortBuffer) {
+      bytesRemaining = elementsRemaining * SIZEOF_SHORT;
+    } else if (buffer instanceof DoubleBuffer) {
+      bytesRemaining = elementsRemaining * SIZEOF_DOUBLE;
+    } else if (buffer instanceof LongBuffer) {
+      bytesRemaining = elementsRemaining * SIZEOF_LONG;
+    }
+    if (bytesRemaining < minBytesRemaining) {
+      throw new IndexOutOfBoundsException("Required " + minBytesRemaining + " remaining bytes in buffer, only had " + bytesRemaining);
+    }
+  }
+}
diff --git a/src/java/com/sun/gluegen/runtime/CPU.java b/src/java/com/sun/gluegen/runtime/CPU.java
new file mode 100755
index 0000000..228ea0f
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/CPU.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.gluegen.runtime;
+
+/** Provides information to autogenerated struct accessors about what
+    kind of architecture (32- or 64-bit) we are currently running
+    on. */
+
+public class CPU {
+  private static boolean is32Bit;
+
+  static {
+    // We don't seem to need an AccessController.doPrivileged() block
+    // here as these system properties are visible even to unsigned
+    // applets
+    // Note: this code is replicated in StructLayout.java
+    String os = System.getProperty("os.name").toLowerCase();
+    String cpu = System.getProperty("os.arch").toLowerCase();
+    if ((os.startsWith("windows") && cpu.equals("x86")) ||
+        (os.startsWith("linux") && cpu.equals("i386")) ||
+        (os.startsWith("mac os") && cpu.equals("ppc")) ||
+        (os.startsWith("sunos") && cpu.equals("sparc")) ||
+        (os.startsWith("sunos") && cpu.equals("x86")) ||
+        (os.startsWith("freebsd") && cpu.equals("i386"))) {
+      is32Bit = true;
+    } else if ((os.startsWith("linux") && cpu.equals("amd64")) ||
+               (os.startsWith("linux") && cpu.equals("x86_64")) ||
+               (os.startsWith("linux") && cpu.equals("ia64")) ||
+               (os.startsWith("sunos") && cpu.equals("amd64"))) {
+    } else {
+      throw new RuntimeException("Please port CPU detection (32/64 bit) to your platform (" + os + "/" + cpu + ")");
+    }
+  }
+
+  public static boolean is32Bit() {
+    return is32Bit;
+  }
+}
diff --git a/src/java/com/sun/gluegen/runtime/DynamicLookupHelper.java b/src/java/com/sun/gluegen/runtime/DynamicLookupHelper.java
new file mode 100755
index 0000000..07417f9
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/DynamicLookupHelper.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.gluegen.runtime;
+
+/** Interface callers may use to use the ProcAddressHelper's {@link
+    ProcAddressHelper#resetProcAddressTable resetProcAddressTable}
+    helper method to install function pointers into a
+    ProcAddressTable. This must typically be written with native
+    code. */
+
+public interface DynamicLookupHelper {
+  public long dynamicLookupFunction(String funcName);
+}
diff --git a/src/java/com/sun/gluegen/runtime/ProcAddressHelper.java b/src/java/com/sun/gluegen/runtime/ProcAddressHelper.java
new file mode 100644
index 0000000..4cf0b76
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/ProcAddressHelper.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.gluegen.runtime;
+
+/** Helper class containing constants and methods to assist with the
+    manipulation of auto-generated ProcAddressTables. */
+
+public class ProcAddressHelper {
+  public static final String PROCADDRESS_VAR_PREFIX = "_addressof_";
+
+  public static void resetProcAddressTable(Object table,
+                                           DynamicLookupHelper lookup) throws RuntimeException {
+    Class tableClass = table.getClass();
+    java.lang.reflect.Field[] fields = tableClass.getDeclaredFields();
+    
+    for (int i = 0; i < fields.length; ++i) {
+      String addressFieldName = fields[i].getName();
+      if (!addressFieldName.startsWith(ProcAddressHelper.PROCADDRESS_VAR_PREFIX)) {
+        // not a proc address variable
+        continue;
+      }
+      int startOfMethodName = ProcAddressHelper.PROCADDRESS_VAR_PREFIX.length();
+      String funcName = addressFieldName.substring(startOfMethodName);
+      try {
+        java.lang.reflect.Field addressField = tableClass.getDeclaredField(addressFieldName);
+        assert(addressField.getType() == Long.TYPE);
+        long newProcAddress = lookup.dynamicLookupFunction(funcName);
+        // set the current value of the proc address variable in the table object
+        addressField.setLong(table, newProcAddress); 
+      } catch (Exception e) {
+        throw new RuntimeException("Can not get proc address for method \"" +
+                                   funcName + "\": Couldn't set value of field \"" + addressFieldName +
+                                   "\" in class " + tableClass.getName(), e);
+      }
+    }
+  }
+}
diff --git a/src/java/com/sun/gluegen/runtime/StructAccessor.java b/src/java/com/sun/gluegen/runtime/StructAccessor.java
new file mode 100644
index 0000000..5a0fa5d
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/StructAccessor.java
@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.gluegen.runtime;
+
+import java.nio.*;
+
+public class StructAccessor {
+  private ByteBuffer   bb;
+  private CharBuffer   cb;
+  private DoubleBuffer db;
+  private FloatBuffer  fb;
+  private IntBuffer    ib;
+  private LongBuffer   lb;
+  private ShortBuffer  sb;
+
+  public StructAccessor(ByteBuffer bb) {
+    // Setting of byte order is concession to native code which needs
+    // to instantiate these
+    this.bb = bb.order(ByteOrder.nativeOrder());
+  }
+
+  public ByteBuffer getBuffer() {
+    return bb;
+  }
+
+  /** Return a slice of the current ByteBuffer starting at the
+      specified byte offset and extending the specified number of
+      bytes. Note that this method is not thread-safe with respect to
+      the other methods in this class. */
+  public ByteBuffer slice(int byteOffset, int byteLength) {
+    bb.position(byteOffset);
+    bb.limit(byteOffset + byteLength);
+    ByteBuffer newBuf = bb.slice();
+    bb.position(0);
+    bb.limit(bb.capacity());
+    return newBuf;
+  }
+
+  /** Retrieves the byte at the specified slot (byte offset). */
+  public byte getByteAt(int slot) {
+    return bb.get(slot);
+  }
+
+  /** Puts a byte at the specified slot (byte offset). */
+  public void setByteAt(int slot, byte v) {
+    bb.put(slot, v);
+  }
+
+  /** Retrieves the char at the specified slot (2-byte offset). */
+  public char getCharAt(int slot) {
+    return charBuffer().get(slot);
+  }
+
+  /** Puts a char at the specified slot (2-byte offset). */
+  public void setCharAt(int slot, char v) {
+    charBuffer().put(slot, v);
+  }
+
+  /** Retrieves the double at the specified slot (8-byte offset). */
+  public double getDoubleAt(int slot) {
+    return doubleBuffer().get(slot);
+  }
+
+  /** Puts a double at the specified slot (8-byte offset). */
+  public void setDoubleAt(int slot, double v) {
+    doubleBuffer().put(slot, v);
+  }
+
+  /** Retrieves the float at the specified slot (4-byte offset). */
+  public float getFloatAt(int slot) {
+    return floatBuffer().get(slot);
+  }
+
+  /** Puts a float at the specified slot (4-byte offset). */
+  public void setFloatAt(int slot, float v) {
+    floatBuffer().put(slot, v);
+  }
+
+  /** Retrieves the int at the specified slot (4-byte offset). */
+  public int getIntAt(int slot) {
+    return intBuffer().get(slot);
+  }
+
+  /** Puts a int at the specified slot (4-byte offset). */
+  public void setIntAt(int slot, int v) {
+    intBuffer().put(slot, v);
+  }
+
+  /** Retrieves the long at the specified slot (8-byte offset). */
+  public long getLongAt(int slot) {
+    return longBuffer().get(slot);
+  }
+
+  /** Puts a long at the specified slot (8-byte offset). */
+  public void setLongAt(int slot, long v) {
+    longBuffer().put(slot, v);
+  }
+
+  /** Retrieves the short at the specified slot (2-byte offset). */
+  public short getShortAt(int slot) {
+    return shortBuffer().get(slot);
+  }
+
+  /** Puts a short at the specified slot (2-byte offset). */
+  public void setShortAt(int slot, short v) {
+    shortBuffer().put(slot, v);
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+
+  private CharBuffer charBuffer() {
+    if (cb == null) {
+      cb = bb.asCharBuffer();
+    }
+    return cb;
+  }
+
+  private DoubleBuffer doubleBuffer() {
+    if (db == null) {
+      db = bb.asDoubleBuffer();
+    }
+    return db;
+  }
+
+  private FloatBuffer floatBuffer() {
+    if (fb == null) {
+      fb = bb.asFloatBuffer();
+    }
+    return fb;
+  }
+
+  private IntBuffer intBuffer() {
+    if (ib == null) {
+      ib = bb.asIntBuffer();
+    }
+    return ib;
+  }
+
+  private LongBuffer longBuffer() {
+    if (lb == null) {
+      lb = bb.asLongBuffer();
+    }
+    return lb;
+  }
+
+  private ShortBuffer shortBuffer() {
+    if (sb == null) {
+      sb = bb.asShortBuffer();
+    }
+    return sb;
+  }
+}